Machinery for dressing stones



UNITED STATES PATENT OFFICE.

JOHN KINMAN, OF' MIFFLINSBURGH, PENNSYLVANIA.

MACHINERY FOR DRESSING STONES.

Specification of Letters Patent No. 5,577, dated May 16, 1848.

To all 'whom t may concern.'

Be it known that I, JOHN KINMAN, of Mifi'linsburgh, Union county, andState of Pennsylvania, have invented a new and useful Machine for Facingand Dressing Millstones, which is described as follows, reference beinghad to the annexed drawings of the same, making part of thisspecification.

Figure 1 is a perspective view of the machine. Fig. 2 is a longitudinalvertical section of the machine on the line :v of Fig. l. Fig. 3 is aperspective view of the carriage which carries the pick and itsappendages during the operation of dressing th-e face of.

the stone. Fig. 4 is a sectional view of the swivel joint of thepropelling power. Fig. 5 is a section of the flexible tube showing thenut and its connection with the shaft.

The nature of my invention and improve'- ment consists in a certain newand useful combination, arrangement, and operation of mechanical devicesfor dressing and facing mill-stones by manual, or other power, by whichthe inclined sides of the angular furrows are cut of the requiredinclination, form, and depth, by a pick secured to the end of avibratory lever operated in the manner of a trip-hammer, whose fulcrumis in a block which is moved at right angles to the furrow while thepick is in operation and is placed in a carriage which is made to movelongitudinally and parallel with the line of the furrows while they arebeing cut.

A Fig. l is the base, or platform, upon which the operative part of themachine is placed. It is made of wood, and is of rectangular form; aboutone third of it on the front side being tapered off so that its surfacewill correspond to a line radiating from the front edge of the guideplate. On the center of this sloping surface is placed, longitudinally,a rib, or way, A of an angular form which is used as a guide for thecarriage C which slides upon it. To the under side of the back part ofthe base a narrow cushion A2 made of worsted cord, covered with leather,is secured, in a position parallel to and near the edge. This cushion isfor the purposeV of being forced into the cavities and accommodatingitself to the irregularities of the surface of the stone by the pressureof the platform and the weights placed upon it. The insistent pressureacting in this manner holds the platform with the guide-plate rigidly inany position in which. it may be fixed. To the front edge of theplatform is secured a metallic guide plate A3 which is of rectangularform the side next the furrow being straightv on its upper and undersides which are parallel to each other, and on its front edge: It beingalso the way on which the front end of the carriage C slides.

C the carriage which slides parallel to the furrows; it is composed oftwo side pieces C and C connected together at their rear end by atransverse piece C2 framed into them. To the under edges of the sidesand end a metallic bottom Clo is secured, whichis strengthened acrossits front end by a metallic plate C3 which also forms the front slideofthe carriage. Across the back end of the bottom a tapered board C4 issecured to which is attache-d on its upper side the adjustable stop C5by means of a clamp screw. This stop is for the purpose of limiting thebackward motion of the sliding block D.-In front of the last namedtransverse board and parallel thereto is placed another piece CG havinga groove made longitudinally along its under side of an angular shapecorresponding to the way A on which it slides. Near the ends of thisgrooved piece projecting from its upper side are two tenons whichcorrespond to mortises in the under side of the frame into which theyare inserted, the depth to which they enter the mortise being governedby the Setscrew C7, which by being turned up or down, lower or rai-se,the rear end of the carriage, the angle of its inclination being thusadjustable so as to adapt it to the dressing of furrows whose sides varyin the degree of their declivity. In front of the grooved crosspiece andparallel to it is another tapering board C8 secured to the under edge ofthe sides of the frame by screws. It is for the `purpose of givingadditional strength and rigidity to the bottom. On the upper edge of thefront end of the side C is secured a hooked stop C9 having a tenonprojecting from its under side, into a slit in the side piececorresponding to it. It is secured to the side by means of a clampscrewwhich renders it easy of adjustment. This stop is for the purpose oflimiting the forward motion of the sliding block. The bottom of thecarriage C10 has a slight degree of curvature, which, in operating themachine causes the bottom of the furrow to be dressed of a similarfigure.

D a block made of cast iron or other metal to be placed in the carriageC, between whose sid-es it lits but is free to move in it longitudinallyas far as the stops C5 and G9 will admit of. It has a cavity in itsupper side sufficiently large to contain the bellows G which areattached to the under side of the box F. Near its front end, and oneither side of the cavity for the bellows are erected the pillars Dhaving holes made through them corresponding with a hole madetransversely through the' box F into which the pin or bolt T on which Fturns is yvibrates upon its axis I in the slit in the inserted. Near itsrear end is erected a segment post D2. D8 D3 are cogs and spacescorresponding with the cogs and spaces on the end of the levers H, H.

E, E, are posts with tenons inserted into corresponding mortises made inthe upper e-dge of the side pieces of the carriage. They are for thepurpose of supporting the pivot or fulcrum E upon which the lever Hturns. I

H, H, levers which turn upon fulcra E E having their lower ends forkedor co-gged, which cogs are inserted into the spaces between the cogs Dsin the sliding block D. The cogs of the lever and the cogs in the block,operating upon each other like a rack and pinion. These levers are forthe purpose of moving the block D back and forth in the carriage.

F the box which contains the cam or tapwheel K, the pick-lever J, thevibratory lever I, the spring M, the set screws i and K2, thewedge-shaped mortise F2 and to the bottom of which box is attached thebellows G by means of the stirrup F3. This box is of a rectangular formmade of wood, its bottom projecting backward and being dressed olf toform the handle F which is for the purpose of raising or depressing thepick by turning the box upon its fulcrum T. Through the back part of thebottom piece a vertical mortise, or slit, is made through which thesegment post D2 passes. Intersecting this vertical slit at its rear endis a horizontal tapering mortise F2, this lastmortise is for the purposeof admitting a wedge or key', which when the rear end of the box israised up to any given elevation is driven .in tightly by which the boxis held rmly at the required degree of elevation. To the edges of thebottom piece are attached the cheeks F6 by means of screws. The cheeksare for the purpose of increasing the width of the bottom in order thata wider stirrup may be secured to it. The increased width of the stirrupadmits of broader bellows. In the bottom of the box and over the bellowsis a slit or mortise for the lever I to vibrate in.

F3 the stirrup secured to the cheeks of the box by screws. To its bottomthek underside g of the bellows is firmly attached.

' Gr a single valve bellows constructed in the 'the under side of thelever. v

usual manner with a spring G secured to the bottom and pressingagainstthe top to keep it distended at all times when it is not acted upon bythe lever I. Its nozzle G3 at its issue is a long narrow slit the cavityenlarging inward. The bellows is for the purpose of blowing the dust anddirt off the surface of the stove and its nozzle is placed in such aposition as to direct the blast to a point directly under the edge ofthe pick as indicated by the arrow.

I is a vibratory lever of a T shape which bottom of the box F. Motion iscommunicated through this lever to the bellows from the pick-lever J,its lower end resting upon the bellows and its u per end reaching toback end of the pick- 'the lever which they do in succession duringtheir revolution it is depressed and the opposite end on which the pickis secured isA raised; if it is desired to increase the stroke of thepick the fulcrum is removed into the hole J3 by this means the arcthrough which the front or pick end vibrates or sweeps is increasedwhile the arc of the back end remains the same. To diminish the strokeor sweep of the pick the pin or fulcrum is removed to J 2.

M is a spring secured at one end to the top of the box F and bearing atits other end upon the outer end of the lever J for the purpose ofincreasing the momentum of the blow of the pick. M is a set screw forthe purpose of increasing the pressure of the spring upon thepick-lever, as in other machines for a similar purpose.

K is a cam, or tap-wheel, for actuating the pick and bellowssimultaneously. It is revolved in the direction indicated by the arrow.The axis K projects beyond the sides of the box on both sides and on itsprojecting ends a right and a left screw are cut. The journals of theaxis rest in boxes formed in the sides of the box F and are secured intheir places lby caps or blocks K3 held down by the set screws K2.

L is the pick;y it is made of the best cast steel in the manner and ofthe form in which hand picks are ordinarily made. When one end becomesdull, or worn, it is reversed on the lever, which brings the other endinto action, the eye being in the middle.

N the connecting or propelling shaft. On one end of this shaft issecured a flexible tube N which embraces it tightly. There are two ofthese flexible tubes each having a nut N4 Fig. 5, secured in one of itsends,l

the nut of one having a right and the nut of .the other a left handscrew cut in it. YThese.-

nuts correspond with, and t upon, the screws cut upon the projectingends of the cam shaft K and with the tubes form a iexible universaljoint which connects the cam with the propelling sha-ft. The other endof the rod is square and fits loosely in the eye S which is made throughthe axle of the pinion S of the propelling power. This mode ofconnecting the shaft with the propelling power by sliding it loosely inthe eye of the pinion, admits of the distance between the power and thepick being varied, by sliding the carriage C along the ways A A3 of theplatform A.

O the base or platform of the propelling power. On one end is erectedthe seat O for the operator who turns the crank, to situpon. Cn theother end is erected the standard or frame R which turns upon a swiveljoint 'at its lower end and is made of wood. It supports the pinion Sand wheel U and the hand crank V which is attached to t-he axis U of thewheel U.

R the swiveled standard or frame is composed of two vertical posts R, R,connected together at their lower ends by two transverse pieces R', R.The standard is made to turn on a swivel in order that the plane ofmotion of the wheel S may always be perpendicular to the connectingshaft N which passes through its hollow axis, that being importantbecause it would not operate well in any other position. See Fig. 4.

R2 is a hand crank for operating the machine by manual power.

Fig. 8 is a perspective view of the oblong rectangular platform orcarriage, made of wood, and into which the sliding block D with the pickand its appendages are placed during the operation of facing the stone.

The following is the mode of operating the before described machine.Preparatory to dressing the furrows of a millstone its face must bedressed, so that all the protuberances are leveled and it forms a trulyplane surface. In facing the stone I first chalk all the protuberanoesupon its surface in the' usual manner by means of the redstaif. Next Iplace the carriage Fig. 3 with the pick and its appendages, in it, inthe proper position o-n one side of the center of 'the stone, thepropelling power being on the other. The operator of the propellingpower is seated on the bench O while the attendant of the pick is seatedupon a low stool placed upon the stone. The propeller lays hold of thehandle of the crank V. The machine is then operated and moved about uponthe stone until suiiciently dressed. Having faced the stone in the usualmanner the next operation is to lay off the furrows in lines,

which being done the platform A is placed upon the stone the front edgeA3 of the guide 4plate being placed accurately on the line o-f thefurrow on the side of the feather edge thereof, weight sufficient tohold the platform firmly in its position being placed upon its rear end.The bottom of the carriage C is now adjusted to the angle at which it isdesired to dress the furrow by means of the set screws C4. The stop gageC5 is next adjusted so that it will allow the sliding block D to movebackward just far enough to bring the edge of the pick to the featheredge of the furrow, then the stop gage C9 is adjusted so as to admit ofthe block being moved forward to bring the edge of the pick preciselyover the back or deep edge of the furrows and there arrest it. Thus theadjustment of the gages governs the width of the furrows. The pick withits sliding block and appendages being placed in the carriage C which isplaced upon the ways on the platform A in its proper position, thepropelling gear being connected with it and properly adjusted upon theopposite side of the center of the stone. The propelling power is nowput into motion as before described and the attendant takes hold of thehandle F of the box and applying force moves the carriage with itsappendages to the right and to the left along the furrow from one end tothe other, and, simultaneously taking hold of the lever H, sliding theblock D and box E with the pick from the feat-her edge of the furrow toits opposite or deep side and back again. By these means the furrow iscut and dressed throughout its entire length and breadth by successiveoperations. During the operation of the pick the bellows performs itsofl'ice of blowing away the grit as fast as it is created by the actionof the pick.

"What I claim as my invention and desire to secure by Letters Patent is-Combining a bellows with a vibrating pick and operating themsimultaneously by the same revolving tappet, or cam wheel, in the mannerand for the purpose above set forth, whether the several parts of themachine be arranged and operated precisely in the manner hereindescribed, or in any other mode which is substantially the same and bywhich analogous results are produced.

In testimony whereof I have hereunto subscribed my name before twowitnesses this 7 day of July A. D. 1847.

JOHN KINMAN.

